/ Dictionary / Index B B supply: Meaning and Definition of Find definitions for: B supply Pronunciation: [key] — Electronics. Electronics. a battery or other source of power for supplying a constant positive voltage to the plate of a vacuum tube. Cf. A supply, C supply. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. B.S.Trans. Bt. Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language